163 lines
4.1 KiB
PHP
163 lines
4.1 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Robin Appelman
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* @copyright 2011 Robin Appelman icewind1991@gmail.com
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* transparent encryption
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*/
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class OC_FileProxy_Encryption extends OC_FileProxy{
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private static $blackList=null; //mimetypes blacklisted from encryption
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private static $enableEncryption=null;
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/**
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* Check if a file requires encryption
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* @param string $path
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* @return bool
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*
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* Tests if encryption is enabled, and file is allowed by blacklists
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*/
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private static function shouldEncrypt( $path ) {
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if ( is_null( self::$enableEncryption ) ) {
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self::$enableEncryption = ( OCP\Config::getAppValue( 'files_encryption', 'enable_encryption', 'true' ) == 'true' );
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}
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if( !self::$enableEncryption ) {
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return false;
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}
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if( is_null(self::$blackList ) ) {
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self::$blackList = explode(',',OCP\Config::getAppValue( 'files_encryption','type_blacklist','jpg,png,jpeg,avi,mpg,mpeg,mkv,mp3,oga,ogv,ogg' ) );
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}
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if( self::isEncrypted( $path ) ) {
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return true;
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}
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$extension = substr( $path, strrpos( $path,'.' ) +1 );
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if ( array_search( $extension, self::$blackList ) === false ){
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return true;
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}
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return false;
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}
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/**
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* Check if a file is encrypted according to database file cache
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* @param string $path
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* @return bool
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*/
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private static function isEncrypted( $path ){
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// Fetch all file metadata from DB
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$metadata = OC_FileCache_Cached::get( $path, '' );
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// Return encryption status
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return isset( $metadata['encrypted'] ) and ( bool )$metadata['encrypted'];
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}
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public function preFile_put_contents( $path, &$data ) {
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if ( self::shouldEncrypt( $path ) ) {
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if ( !is_resource( $data ) ) {//stream put contents should have been converter to fopen
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$size = strlen( $data );
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$data = Crypt::blockEncrypt( $data );
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OC_FileCache::put( $path, array( 'encrypted'=>true, 'size' => $size ), '' );
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}
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}
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}
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public function postFile_get_contents($path,$data){
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if(self::isEncrypted($path)){
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$cached=OC_FileCache_Cached::get($path,'');
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$data=OC_Crypt::blockDecrypt($data,'',$cached['size']);
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}
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return $data;
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}
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public function postFopen($path,&$result){
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if(!$result){
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return $result;
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}
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$meta=stream_get_meta_data($result);
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if(self::isEncrypted($path)){
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fclose($result);
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$result=fopen('crypt://'.$path,$meta['mode']);
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}elseif(self::shouldEncrypt($path) and $meta['mode']!='r' and $meta['mode']!='rb'){
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if(OC_Filesystem::file_exists($path) and OC_Filesystem::filesize($path)>0){
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//first encrypt the target file so we don't end up with a half encrypted file
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OCP\Util::writeLog('files_encryption','Decrypting '.$path.' before writing',OCP\Util::DEBUG);
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$tmp=fopen('php://temp');
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OCP\Files::streamCopy($result,$tmp);
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fclose($result);
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OC_Filesystem::file_put_contents($path,$tmp);
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fclose($tmp);
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}
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$result=fopen('crypt://'.$path,$meta['mode']);
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}
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return $result;
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}
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public function postGetMimeType($path,$mime){
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if(self::isEncrypted($path)){
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$mime=OCP\Files::getMimeType('crypt://'.$path,'w');
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}
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return $mime;
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}
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public function postStat($path,$data){
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if(self::isEncrypted($path)){
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$cached=OC_FileCache_Cached::get($path,'');
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$data['size']=$cached['size'];
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}
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return $data;
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}
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public function postFileSize($path,$size){
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if(self::isEncrypted($path)){
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$cached=OC_FileCache_Cached::get($path,'');
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return $cached['size'];
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}else{
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return $size;
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}
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}
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}
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